By Jeremy Bernstein
Date 2014-05-29 10:01
Hi,
If you are only using the WDL bases, there is no information about the 50-move rule available. In that case, the Syzygy probe returns a move list which contains winning/drawing moves, but without regard for the distance, causing "wrong" moves to be searched further (we saw a position where a winning position was drawn when a "winning" move entered a variation containing only piece movement, ending in mate after 53 moves, too bad!).
So with DTZ bases additionally, I get:
4k3/1R6/r2n4/5K2/8/4P3/8/8 w - - bm Kf4 (Kg5, Ke5 also win fastest) // WDL-only: Kf4
8/6r1/8/5K2/8/1kP5/N2R4/8 w - - bm Ke6 (Ke5, Rh2 also win fastest) // WDL-only: Re2, then Ke5, Ke4
6k1/4R3/6p1/6K1/7P/8/2b5/8 w - - bm Rc7 (Kh6, Ra7 also win fastest) // WDL-only: Ra7
8/8/4kp2/1P3R2/6K1/1r6/8/8 w - - bm Rc5 (Rh5, Rf4, Rf3, Rf2, Rf1, b6 also draw) // WDL-only: Rc5
r7/8/Pk6/2N5/6K1/8/2R5/8 b - - bm Rh8 (Kb5, Rd8, Re8, Rg8+, Ra7 also draw) // WDL-only: Re8
8/8/8/R7/P3K1kp/8/8/5b2 w - - bm Ra7 (only winning move) // WDL-only: Ra7
8/1B6/5k2/5P2/8/2K1Pn2/8/8 b - - bm Nh2 (Ne5, Ng5, Ng1 also draw) // WDL-only: Nh2
I am a little puzzled. Of course, since you didn't actually mention what the bug is that you found, it's hard to know if anything that I just tested was relevant. Please provide some more information when you have a moment.
The Syzygy TBs without DTZ are not very useful, IMO. I believe that Stockfish testing also demonstrated that there was no particular strength improvement by using the WDL bases only, and if you are using Komodo for analysis, you need the 50-move rule information. My advice: get the DTZs.
Jeremy
By Jeremy Bernstein
Date 2014-05-29 14:11
By the way, there was a problem with the initial uploaded version of 7a which caused problems on WDL-only systems. Without knowing what problem you're having, it might be a good idea to download the engine again and make sure that you didn't get one of those early copies. Nevertheless: the DTZs are recommended.
jb